Hi,
I am using Avaya breeze JavaScript CSDK 4.2.0.0. I am able to log in a
user to all call, messaging, device Services. After login, we need to pass user object to controllers to access functions such as get contacts, update contacts etc. Now I want to give multitab support in my application. The issue is, I am getting user object undefined after a refresh or new tab because it is lost.
Please help us to know how to persist user object in such cases.

It sounds like you are looking for a feature for the JavaScript CSDK to replicate itself across tabs. Unfortunately it doesn't have that feature. You may be able to implement something on top of it using BroadcastChannel or other method to communicate between tabs and have one tab that acts as the primary that hosts the CSDK.

Similarly, regarding refreshes, the CSDK will need to be re-initialized after a page refresh.

Earlier today, we identified an issue where users were unable to login using ... SDK that is resulting in errors in the console logs and is rendering the SDK to not. To know more info. visit http://www.msgclub.net/